Under consideration are the MP-200 stylus or upgraded NOS preamp tubes. :)
Actually preamp tubes can make a huge difference, I switched from modern JJ to some of the best military Telefunken ecc801s and then to cheaper but very nice Sylvania 12at7WA (Gold) and then to Matsushita 12at7WA (find in my system). NOS tubes are great when you know a particular model or brand @xs1137
And you must keep your stylus fresh, so it’s always important. However, some of those new Nagaoka styli cost like a whole new cartridge and if you owned a Signet you have to search audiogon for Signet TK-10ML and related top of the line Signet models, they are superior to any modern AT and so much better than any Nagaoka. You have to ask @nandric about his NOS Signet samples.